Abstract
The hot deformation characteristics of AZ31 magnesium alloy rod extruded at temperatures of 300 °C, 350 °C and 450 °C have been studied in compression. The extruded material had a fiber texture with parallel to the extrusion axis. When extruded at 450 °C, the texture was less intense and the direction moved away from the extrusion axis. The processing maps for the material extruded at 300 °C and 350 °C are qualitatively similar to the material with near-random texture (cast-homogenized) and exhibited three dynamic recrystallization (DRX) domains. In domains #1 and #2, prismatic slip is the dominant process and DRX is controlled by lattice self-diffusion and grain boundary self-diffusion, respectively. In domain #3, pyramidal slip occurs extensively and DRX is controlled by cross-slip on pyramidal slip systems. The material extruded at 450 °C exhibited two domains similar to #1 and #2 above, which moved to higher temperatures, but domain #3 is absent. The results are interpreted in terms of the changes in fiber texture with extrusion temperature. Highly intense texture, as in the rod extruded at 350 °C, will enhance the occurrence of prismatic slip in domains #1 and #2 and promotes pyramidal slip at temperatures >450 °C (domain #3).
Highlights
In recent years magnesium alloys are being given increasing attention as light-weight high specific stiffness materials for use as structural parts in aerospace, automobile and computer hardware applications [1]
The cast material had a large grain size while the rods extruded at 300 °C, 350 °C and 450 °C exhibited finer equiaxed grains with average grain diameters of 12, 16 and 9 μm, respectively
The intensity of < 10 1 0 > texture in the rod extruded at 350 °C is highest of all the extruded conditions and as discussed in the previous section, this reduces the participation of basal slip and increases the contribution of prismatic slip in domains #1 and #2
Summary
In recent years magnesium alloys are being given increasing attention as light-weight high specific stiffness materials for use as structural parts in aerospace, automobile and computer hardware applications [1]. The initial microstructure has a strong influence on the hot working behavior of AZ31 alloy [2] which is through the effect of the initial texture [16] on the dynamic recrystallization (DRX) process. The aim of the present investigation is to evaluate the influence of extrusion temperature on the hot working characteristics of AZ31 extruded product through its effect primarily on the texture developed in the starting material. The hot deformation behavior is explored using the methods of kinetic analysis as well as processing maps The former one is based on the standard kinetic rate equation relating the flow stress (σ) to strain rate ( ε ) and temperature (T), given by [20]:. The processing-map technique has been highly successful in evaluating the hot deformation mechanisms in a wide range of Mg and its alloys [32,33,34,35,36,37,38,39,40,41] including DRX and flow instabilities
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